Paul D. Wolfowitz once wrote that a major lesson of the cold war for American foreign policy was ''the importance of leadership and what it consists of: not lecturing and posturing and demanding, but demonstrating that your friends will be protected and taken care of, that your enemies will be punished, and that those who refuse to support you will regret having done so.'' Mr. Wolfowitz's career has hewed to those same unshrinking precepts.

Deputy Defense Secretary Paul D. Wolfowitz, a prime architect of the Bush administration's Iraq policy, said Tuesday that the Pentagon had underestimated the violent tenacity of an insurgency that formed after Baghdad fell, and he acknowledged that the United States may be forced to keep a significant number of troops in Iraq for years to come.

Paul D. Wolfowitz, the deputy defense secretary, said Saturday that the Bush administration was justified in toppling Saddam Hussein, regardless of whether American intelligence before the war that Iraq had stockpiled unconventional weapons was proved wrong.

Defense Secretary Donald H. Rumsfeld and his senior advisers have assigned a small intelligence unit to search for information on Iraq's hostile intentions or links to terrorists that the nation's spy agencies may have overlooked, Pentagon officials said today. Some officials say the creation of the team reflects frustration on the part of Mr. Rumsfeld, Deputy Defense Secretary Paul D. Wolfowitz and other senior officials that they are not receiving undiluted information on the capacities of President Saddam Hussein of Iraq and his suspected ties to terrorist organizations.

In an administration that is not exactly a hotbed of Saddam coddlers, Paul Wolfowitz has been on the case longer, more consistently, more persistently, than anyone. His tenacity is one reason that the internal debate has moved, astonishingly fast, from a theoretical possibility to questions of method and timing. So fast, in fact, that one argument some make for invading is that Bush has already gone too far out on the limb to back down.

The Bush administration is struggling with its first high-level quarrels over the scope and timing of its military response to last week's attack on the United States, administration officials said. Some senior administration officials, led by Paul D. Wolfowitz, deputy secretary of defense, and I. Lewis Libby, chief of staff to Vice President Dick Cheney, are pressing for the earliest and broadest military campaign against not only the Osama bin Laden network in Afghanistan, but also against other suspected terrorist bases in Iraq and in Lebanon's Bekaa region.

In a broad new policy statement that is in its final drafting stage, the Defense Department asserts that America's political and military mission in the post-cold-war era will be to insure that no rival superpower is allowed to emerge in Western Europe, Asia or the territory of the former Soviet Union.

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